Safety hook



FIG. 1 is a front perspective view of a safety hook embodying the design. The opposite side of the _design is identical to that shown in FIG. 1.

FIG. 2 is a side elevational view of the design.

FIG. 3 is a side elevational view thereof, showing the side opposite that shown in FIG. 2.

FIG. 4 is an enlarged front perspective view thereof. 

The ornamental design for a safety hook, substantially as shown and described. 